2) If using icon on window bar (again not default) as above in style tab (default tab) drag and drop icon into hidden.

3) If accidentally hitting shortcut key? delete shortcut as above on the keyboard tab. (normally default is to have none)

If other way? probably a setting some where?Let us know

P.S. I like to put the shade icon (#2) on the opposite side of the window bar (for accidents and easy see window underneath), being by itself it easy to see the state in (icon animates in most styles) and can rectify how-ever happened

1. go to settings>setting editor2.click on xfwm4 in 'chanel side bar3.click on general to display tree list and find one called 'mouesewheel_rollup'4.click on to highlight and click edit icon at top of window5. its a Bool so all you need to do is uncheck enable box.6.save